asp+access:添加一个新字段后不能插入数据

原来ACCESS数据库用的很正常.在数据库中添加一个新的字段后,再插入数据时就报错.
语句如下:
<%
dim rs
set rs = server.createobject("adodb.recordset")
sql="select * from dushi "
rs.open sql,conn,1,2

dim bankuai,fenlei,biaoti,neir,shij,zuoz
bankuai = request.form("bankuai")
fenlei = request.form("fenlei")
biaoti = request.form("biaoti")
neir = request.form("neir")
shij = request.form("shij")
zuoz = request.form("zuoz")

rs.addnew
rs("bankuai")=bankuai
rs("fenlei")=fenlei
rs("biaoti")=biaoti
rs("neir")=neir
rs("shij")=shij
rs("zuoz")=zuoz
rs.update

rs.close
set rs=nothing
%>
前面已有数据库连接语句,可以正常插入数据.
当在ACCESS里添加了一个字段 mingch 之后就不能插入数据了.
报错:Microsoft OLE DB Provider for ODBC Drivers (0x80004005)
[Microsoft][ODBC Microsoft Access Driver]行中有错误
所指的那一行是"rs.update"

<%
dim rs
set rs = server.createobject("adodb.recordset")
sql="select * from dushi "
rs.open sql,conn,1,2

dim bankuai,fenlei,mingch,biaoti,neir,shij,zuoz
bankuai = request.form("bankuai")
fenlei = requ